Apparatus and method for assembling crankshaft-sprocket

Abstract

An apparatus for assembling a crankshaft-sprocket aligns a timing mark of a sprocket to a predetermined line of a crankshaft, and includes a slider for slidably moving an interior circumference surface of the sprocket to an exterior circumference surface of the crankshaft. A guider is disposed on an end portion of the crankshaft so as to guide the slider to the crankshaft. A first aligner is disposed on the slider so as to align the timing mark of the sprocket to a predetermined portion of the slider. A second aligner aligns the slider such that the timing mark aligned by the first aligner is positioned to the predetermined line of the crankshaft.

1. An apparatus for assembling a crankshaft-sprocket such that a timing mark of a sprocket is positioned to a predetermined line of a crankshaft, comprising:
 a slider for slidably moving an interior circumference surface of the sprocket to an exterior circumference surface of the crankshaft, after holding the sprocket; 
 a guider disposed on an end portion of the crankshaft so as to guide the slider to the crankshaft; 
 a first aligner disposed on the slider so as to align the timing mark of the sprocket to a predetermined portion of the slider; and 
 a second aligner for aligning the slider such that the timing mark aligned by the first aligner is positioned to the predetermined line of the crankshaft. 
 
   
   
     2. The apparatus of  claim 1 , wherein the first aligner comprises:
 a mounting portion formed at an end portion of the slider so as to mount the sprocket; 
 an inserting hole formed at an exterior circumference surface of an end portion of the slider, and extended to an interior circumference surface of the slider toward a center of the slider; and 
 a pin inserted into the inserting hole, and inserted between teeth formed at an exterior circumference surface of the sprocket, such that the timing mark is aligned to the predetermined portion of the slider. 
 
   
   
     3. The apparatus of  claim 2 , wherein the second aligner comprises:
 a catch groove formed at the end surface of the crankshaft; and 
 a catch projection disposed on a determined portion of the end surface of the guider so as to be inserted to the catch groove, 
 wherein the determined portion of the end surface of the guider is determined to be a location in which the timing mark aligned by the slider is aligned to the predetermined line when the slider is inserted to the crankshaft along the guider after the catch projection is inserted into the catch groove. 
 
   
   
     4. The apparatus of  claim 1 , further comprising a subsidiary guider disposed between an interior circumference surface of the slider and an exterior circumference surface of the guider such that the slider moves straightly along the guider. 
   
   
     5. The apparatus of  claim 4 , wherein the subsidiary guider comprises:
 a key mounted to the exterior circumference surface of the guider; and 
 a key guider formed at the interior circumference surface of the slider along the length direction of the slider. 
 
   
   
     6. The apparatus of  claim 1 , wherein the crankshaft and the guider are coupled to each other by a coupling unit. 
   
   
     7. The apparatus of  claim 6 , wherein the coupling unit comprises:
 a screw hole which is formed at the end surface of the crankshaft; 
 a penetration hole penetrating through the guider along a length direction of the guider; and 
 a bolt coupled to the screw hole after being inserted into the penetration hole. 
 
   
   
     8. A method for assembling a crankshaft-sprocket, comprising:
 aligning a predetermined portion of an end potion of a guider to an end portion of a crankshaft using a second aligner; 
 aligning a timing mark of the sprocket to predetermined portion of a slider using a first aligner, after inserting the sprocket into the slider; 
 thrusting the aligned sprocket onto the crankshaft, after inserting the slider into the guider; 
 releasing the first aligner and drawing out the slider, after the sprocket is fixed to the crankshaft; and 
 releasing the second aligner and separating the guider from the crankshaft. 
 
   
   
     9. The method of  claim 8 , comprising heating a sprocket before the inserting the sprocket into the crankshaft.